Mime sniffer: reduce table from 256 bytes to 4

net/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 import("//url/config.gni")
 import("//testing/test.gni")
@@ skipping 1597 matching lines @@
       ":net",
       "//base",
       "//third_party/boringssl",
     ]
   }
 }
 
 executable("net_perftests") {
   testonly = true
   sources = [
+    "base/mime_sniffer_perftest.cc",
     "cookies/cookie_monster_perftest.cc",
     "disk_cache/blockfile/disk_cache_perftest.cc",
     "proxy/proxy_resolver_perftest.cc",
     "udp/udp_socket_perftest.cc",
   ]
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   deps = [
     "//base",
@@ skipping 14 matching lines @@
   } else {
     sources -= [ "proxy/proxy_resolver_perftest.cc" ]
   }
 
   if (is_win && icu_use_data_file) {
     # This is needed to trigger the dll copy step on windows.
     # TODO(mark): Specifying this here shouldn't be necessary.
     deps += [ "//third_party/icu:icudata" ]
   }
 }